df

Display free disk space.
With no arguments, `df' reports the space used and available on all currently
mounted filesystems (of all types). Otherwise, `df' reports on the filesystem
containing each argument file.

Syntax
df [-b | -h | -H | -k | -m | -P] [-ailn] [-t type]
[file | filesystem ...]
Options
-a Show all mount points, including those that were mounted with the
MNT_IGNORE flag.
-b Use 512-byte blocks rather than the default. Note that this
overrides the BLOCKSIZE specification from the environment.
-g Use 1073741824-byte (1-Gbyte) blocks rather than the default.
Note that this overrides the BLOCKSIZE specification from the
environment.
-H "Human-readable" output. Use unit suffixes: Byte, Kilobyte,
Megabyte, Gigabyte, Terabyte and Petabyte in order to reduce the
number of digits to three or less using base 10 for sizes.
-h "Human-readable" output. Use unit suffixes: Byte, Kilobyte,
Megabyte, Gigabyte, Terabyte and Petabyte in order to reduce the
number of digits to three or less using base 2 for sizes.
-i Include statistics on the number of free inodes.
-k Use 1024-byte (1-Kbyte) blocks rather than the default. Note
that this overrides the BLOCKSIZE specification from the environ-
ment.
-l Only display information about locally-mounted filesystems.
-m Use 1048576-byte (1-Mbyte) blocks rather than the default. Note
that this overrides the BLOCKSIZE specification from the environ-
ment.
-n Print out the previously obtained statistics from the filesys-
tems. This option should be used if it is possible that one or
more filesystems are in a state such that they will not be able
to provide statistics without a long delay. When this option is
specified, df will not request new statistics from the filesys-
tems, but will respond with the possibly stale statistics that
were previously obtained.
-P Use POSIX compliant output of 512-byte blocks rather than the
default. Note that this overrides the BLOCKSIZE specification
from the environment.
-t Only print out statistics for filesystems of the specified types.
More than one type may be specified in a comma separated list.
The list of filesystem types can be prefixed with `no' to spec-
ify the filesystem types for which action should not be taken.
For example, the df command:
df -t nonfs,mfs
lists all filesystems except those of type NFS and MFS. The
lsvfs(1) command can be used to find out the types of filesystems
that are available on the system.